[Python] operationalError at admin/... at most 64 tables in a join

operationalError at /admin... at most 64 tables in a join
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class ReagentInventory(models.Model):
company = models.ForeignKey(Company, on_delete=models.CASCADE)
manufacturing_unit = models.ForeignKey(ManufacturingUnit, on_delete=models.CASCADE)
ManufacturingPlant = models.ForeignKey(ManufacturingPlant, on_delete=models.CASCADE)
reagent_name = models.ForeignKey(Reagent, on_delete=models.CASCADE)
storage_location = models.ForeignKey(StorageLocation, on_delete=models.CASCADE)
current_stock = models.DecimalField(decimal_places=3, max_digits=10, )
measuring_unit = models.ForeignKey(MeasurementUnit, on_delete=models.CASCADE)
reagent_lot_no = models.CharField(max_length=20)
reagent_mother_lot_no = models.CharField(max_length=20)
challan_no = models.CharField(max_length=20)
mother_expiry_date = models.DateField()
assigned_expiry_date = models.DateField()
received_date = models.DateField()
opening_date = models.DateField(blank=True)
number_of_container = models.IntegerField()
packing_mode = models.ForeignKey(PackingMode, on_delete=models.CASCADE)
manufacturing_country = models.ForeignKey(Country, on_delete=models.CASCADE)
supplier = models.ForeignKey(Supplier, on_delete=models.CASCADE)
manufacturer = models.ForeignKey(Manufacturer, on_delete=models.CASCADE)

class Meta:
verbose_name_plural = 'Reagent Inventories'

def __str__(self):
return self.reagent_name

def __unicode__(self):
return self.reagent_name

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